An intelligent control method and system for printing process of ink printing machine

Abstract

The present invention discloses an intelligent control method for the printing process of an ink printer, including marking a plurality of pressure-sensitive points on the first side of the printing paper and obtaining the first coordinates; performing ink printing on the first side of the printing paper and collecting the first printing parameters, obtaining the second coordinates of the pressure-sensitive points after the printing is completed, calculating the offset of the pressure-sensitive points according to the first coordinates and the second coordinates, predicting the deformation degree of the paper in combination with the first printing parameters and the prediction model, and evaluating the printing quality of the first side when it is determined that the deformation degree of the paper is less than a preset threshold; if the printing quality of the first side meets the preset conditions, the first printing parameters are corrected according to the deformation degree of the paper to obtain the second printing parameters, so as to perform ink printing on the second side of the printing paper. The present invention accurately predicts the deformation degree according to the offset of the pressure-sensitive points and the printing parameters, and corrects the printing parameters in combination with the printing quality, thereby improving the quality of double-sided printing.

Description

Technical Field

[0001] The present invention relates to the field of printing control technology, and in particular to an intelligent control method and system for a printing process of an ink printing machine. Background Art

[0002] In order to comply with the low-carbon environmental protection concept and promote sustainable development, the application of double-sided printing in life is becoming more and more popular. Double-sided printing can print the front and back of the paper at the same time. Compared with single-sided printing, it can greatly reduce the use of paper, thereby reducing the amount of trees cut down and reducing carbon footprint.

[0003] In the traditional double-sided printing process, in order to ensure the effect of printing on both sides, it is usually necessary to accurately control the printing parameters. However, the existing technology still has certain limitations in this regard: First, the existing methods often rely on experience and rough estimates to predict the degree of deformation of the paper, which leads to inaccurate prediction results, which in turn affects the alignment accuracy of the second printing. Second, there is a lack of intelligent means to adjust the parameters of the secondary printing, and it can only rely on manual experience. Therefore, it is difficult to accurately grasp the printing parameters, which not only results in low printing quality but also is time-consuming and labor-intensive. Third, when printing, the existing technology usually evaluates the printing effect as a whole after double-sided printing. This will result in that when one side is not printed up to standard, the printing work on the second side will also be wasted, resulting in a waste of resources and increased rework costs. Summary of the invention

[0004] In order to solve at least one of the above-mentioned technical problems, the present invention provides an intelligent control method and system for a printing process of an ink printing press.

[0005] In a first aspect, the present invention provides an intelligent control method for a printing process of an inkjet printer, the method comprising:

[0006] Obtain printing paper to be printed on both sides, mark a number of pressure-sensitive points on the first side of the printing paper, and obtain first coordinates of the pressure-sensitive points;

[0007] Perform ink printing on the first side of the printing paper and collect first printing parameters, obtain second coordinates of the pressure sensitive point after printing, and calculate the offset of the pressure sensitive point according to the first coordinates and the second coordinates; wherein the first printing parameters include the printing temperature, printing speed and paper humidity of the ink printer;

[0008] Predicting the deformation degree of the paper according to the offset of the pressure sensitive point, the first printing parameter and the preset prediction model, and judging whether the deformation degree of the paper is less than a preset threshold;

[0009] When it is determined that the deformation degree of the paper is less than a preset threshold, evaluating the printing quality of the first side;

[0010] If the printing quality of the first side meets the preset conditions, the first printing parameters are corrected according to the deformation degree of the paper to obtain second printing parameters, and the second printing parameters are used to perform ink printing on the second side of the printing paper.

[0011] Preferably, the method further comprises:

[0012] When it is determined that the deformation degree of the paper is greater than or equal to the preset threshold, the current printing paper is discarded, the first printing parameter is corrected according to the deformation degree of the paper to obtain the third printing parameter, and the third printing parameter is used to perform ink printing on the next printing paper.

[0013] Preferably, the method further comprises:

[0014] If the printing quality of the first side does not meet the preset conditions, the current printing paper is discarded and the corresponding defect type is determined;

[0015] When the defect type is a paper surface defect, the third printing parameter is used to perform ink printing on the next printing paper;

[0016] When the defect type is an ink quantity defect, the ink supply quantity is adjusted, the third printing parameter is compensated, and ink printing is performed on the next printing paper according to the compensated third printing parameter.

[0017] Preferably, predicting the deformation degree of the paper according to the offset of the pressure sensitive point, the first printing parameter and a preset prediction model includes:

[0018] Building a predictive model:

[0019]

[0020] In the formula, ΔL represents the deformation degree of the paper, e represents the natural constant, D represents the offset of the pressure sensitive point, H, T, and V represent the paper humidity, printing temperature, and printing speed respectively; α, β, are the unknown coefficients to be fitted respectively;

[0021] Build a linear regression model:

[0022]

[0023] In the formula, i represents the i-th group of data, and a total of n groups of data are obtained;

[0024] Use the least squares method to find α, β, Perform linear fitting and solve the solved α, β, Substitute into the prediction model to generate the target prediction model;

[0025] The offset of the pressure sensitive point and the first printing parameter are input into the target prediction model to predict the deformation degree of the paper.

[0026] In a second aspect, the present invention further provides an intelligent control system for a printing process of an inkjet printer, the system comprising:

[0027] A sensitive point marking unit is used to obtain the printing paper to be printed on both sides, mark a number of pressure sensitive points on the first side of the printing paper, and obtain the first coordinates of the pressure sensitive points;

[0028] an offset calculation unit, used to perform ink printing on the first side of the printing paper and collect first printing parameters, obtain second coordinates of the pressure sensitive point after printing, and calculate the offset of the pressure sensitive point according to the first coordinates and the second coordinates; wherein the first printing parameters include the printing temperature, printing speed and paper humidity of the ink printer;

[0029] A deformation degree prediction unit, used to predict the deformation degree of the paper according to the offset of the pressure sensitive point, the first printing parameter and a preset prediction model, and to determine whether the deformation degree of the paper is less than a preset threshold;

[0030] A printing quality evaluation unit, configured to evaluate the printing quality of the first side when it is determined that the deformation degree of the paper is less than a preset threshold;

[0031] The first correction unit is used to correct the first printing parameter to obtain the second printing parameter according to the deformation degree of the paper if the printing quality of the first side meets the preset condition, and use the second printing parameter to perform ink printing on the second side of the printing paper.

[0032] Preferably, the system further comprises:

[0033] The second correction unit is used to eliminate the current printing paper when it is determined that the deformation degree of the paper is greater than or equal to a preset threshold, correct the first printing parameter according to the deformation degree of the paper to obtain a third printing parameter, and use the third printing parameter to perform ink printing on the next printing paper.

[0034] Preferably, the system further comprises a parameter compensation unit, configured to:

[0035] If the printing quality of the first side does not meet the preset conditions, the current printing paper is discarded and the corresponding defect type is determined;

[0036] When the defect type is a paper surface defect, the third printing parameter is used to perform ink printing on the next printing paper;

[0037] When the defect type is an ink quantity defect, the ink supply quantity is adjusted, the third printing parameter is compensated, and ink printing is performed on the next printing paper according to the compensated third printing parameter.

[0038] In a third aspect, the present invention further provides an electronic device comprising a processor and a memory, wherein the memory is used to store computer program code, and the computer program code comprises computer instructions. When the processor executes the computer instructions, the electronic device executes the method as described in the first aspect above and any possible implementation thereof.

[0039] In a fourth aspect, the present invention further provides a computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, wherein the computer program includes program instructions, and when the program instructions are executed by a processor of an electronic device, the processor executes the method as described in the first aspect above and any possible implementation thereof.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] 1) The present invention can accurately predict the deformation degree of paper by using a preset prediction model by accurately measuring the offset of the pressure sensitive point before and after printing, combining parameters such as printing speed, temperature and paper humidity, thereby improving the accuracy of the prediction.

[0042] 2) After the deformation degree of the paper is obtained, it is determined whether the deformation degree of the paper is less than the preset threshold. If so, the printing quality is further considered, and the printing strategy is further considered based on the printing quality. If not, the current printing paper is discarded, and the first printing parameter is corrected according to the deformation degree of the paper to obtain the third printing parameter, and the third printing parameter is used to perform ink printing on the next printing paper. Since the quality assessment is carried out in time after the first side is printed, it is possible to accurately control whether the second side needs to be printed. Compared with the overall quality assessment after printing, it can avoid the problem of unqualified quality of one side affecting the second side and causing waste of resources, which can greatly improve resource utilization and reduce rework costs.

[0043] 3) When the deformation degree of the paper is less than the preset threshold and the printing quality of the first side is evaluated, if the printing quality of the first side meets the preset conditions, the first printing parameter is corrected according to the deformation degree of the paper to obtain the second printing parameter, and the second printing parameter is used to print ink on the second side of the printing paper; if the printing quality of the first side does not meet the preset conditions, the current printing paper is discarded and the corresponding defect type is determined; when the defect type is a paper surface defect, the third printing parameter is used to print ink on the next printing paper; when the defect type is an ink quantity defect, the ink supply is adjusted, the third printing parameter is compensated, and the next printing paper is printed with ink according to the compensated third printing parameter. Therefore, the present invention considers using different parameter adjustment measures for different defects, and can provide reasonable solutions to different quality problems in a targeted manner, and ultimately greatly improve the quality of printed products.

[0044] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the background technology, the drawings required for use in the embodiments of the present invention or the background technology will be described below.

[0046] The drawings herein are incorporated into the specification and constitute a part of the specification. These drawings illustrate embodiments consistent with the present disclosure and are used to illustrate the technical solutions of the present disclosure together with the specification.

[0047] Figure 1 A schematic flow chart of an intelligent control method for a printing process of an ink printing press provided by an embodiment of the present invention;

[0048] Figure 2 A schematic flow chart of an intelligent control method for a printing process of an ink printing press provided by another embodiment of the present invention;

[0049] Figure 3 A schematic diagram of the structure of an intelligent control system for a printing process of an ink printing machine provided by an embodiment of the present invention;

[0050] Figure 4 A schematic structural diagram of an intelligent control system for a printing process of an ink printing press provided in another embodiment of the present invention. DETAILED DESCRIPTION

[0051] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0053] In the current double-sided printing process, there are still problems such as the inability to accurately control paper deformation and the inability to accurately adjust printing parameters, which leads to problems such as unsatisfactory printing quality, high rework costs, low resource utilization and low printing efficiency. To this end, the present invention provides an intelligent control method for the printing process of an ink printing press, which can accurately predict paper deformation and accurately adjust printing parameters according to different situations, thereby greatly improving printing quality, efficiency and resource utilization, and enhancing the energy efficiency of double-sided printing.

[0054] See also Figure 1 , Figure 1 The present invention provides a flow chart of an intelligent control method for an inkjet printer printing process. Figure 1 As shown, the method includes:

[0055] S10, obtaining printing paper to be printed on both sides, marking a number of pressure sensitive points on the first side of the printing paper, and obtaining first coordinates of the pressure sensitive points.

[0056] Prepare the paper for double-sided printing, making sure that the paper material and specifications meet the printing requirements. Use a marking tool to mark several points on the first side of the paper as pressure-sensitive points. These points can be evenly distributed over the entire surface of the paper, or they can be marked according to specific printing areas. The number and location of the marking points depends on the printing design and the pressure changes that need to be monitored.

[0057] Once the pressure sensitive points are marked, measure and record the coordinate position of each pressure sensitive point on the printed paper. The coordinate system can be a relative coordinate system based on the edge of the printed paper, such as measuring from the upper left corner. The coordinates are usually three-dimensional coordinates and recorded in millimeters, such as (x, y, z), where x represents the distance from the left edge, y represents the distance from the top edge, and the z coordinate can be half the thickness of the paper or the height of the slight bend of the paper at that point.

[0058] For ease of understanding, take A4 printing paper (210mm*297mm) as an example, mark 9 pressure sensitive points on the first side of the printing paper to form a 3×3 grid layout. The coordinates of the marked points are shown in Table 1 below:

[0059] Table 1

[0060] Point Number x coordinate (mm) Y coordinate (mm) z coordinate (mm) P1 50 50 0.1 P2 105 50 0.1 P3 160 50 0.1 P4 50 148.5 0.1 P5 105 148.5 0.1 P6 160 148.5 0.1 P7 50 247 0.1 P8 105 247 0.1 P9 160 247 0.1

[0061] It can be understood that the position of the pressure sensitive points in the horizontal and vertical directions will change when the paper is deformed during printing, so the coordinates here take into account the coordinate values ​​in the z-axis direction. Before printing, the paper is usually flat, so the z-coordinate values ​​are usually the same. After printing the first side, the second coordinates of these pressure sensitive points are obtained again. At this time, the offsets of the pressure sensitive points in the horizontal and z-axis directions can be calculated respectively, thereby obtaining the overall offset.

[0062] It is important to emphasize that the selection of marking points should take into account the coverage of the printing area to ensure that the pressure distribution during the printing process can be fully evaluated. The marking points should be obvious enough so that their position changes can be clearly identified after printing. The marking tool is preferably a pressure-sensitive tape that does not interfere with the printing process or affect the print quality.

[0063] Therefore, this embodiment can select a limited number of pressure sensitive points to accurately calculate the offset of the pressure sensitive points before and after printing, thereby providing a reliable basis for subsequent evaluation of the deformation degree of the paper.

[0064] S20, printing ink on the first side of the printing paper and collecting first printing parameters, obtaining the second coordinates of the pressure sensitive point after printing, and calculating the offset of the pressure sensitive point according to the first coordinates and the second coordinates; wherein the first printing parameters include the printing temperature, printing speed and paper humidity of the ink printer.

[0065] First, the first side of the printing paper is printed using an ink printer, and then during the printing process, the first printing parameters are recorded, including the current printing temperature, printing speed, and paper humidity. Among them, a higher temperature during the printing process causes the paper to absorb more heat, causing the paper to expand. The increase in temperature may also cause the ink to dry faster, thereby changing the moisture distribution on the surface of the paper, which in turn affects the dimensional stability of the paper. A higher printing speed means that the paper passes through the printing press for a shorter time, which reduces the time for the ink to dry and may cause the surface of the paper to be wet for a longer time. When printing at high speed, the paper moves faster in the printing press, increasing the friction and tension on the paper, which may cause the paper to deform. The humidity of the paper directly affects the hygroscopicity of the paper, and higher humidity causes the paper to absorb more moisture, causing expansion. Changes in humidity can also cause the internal fibers of the paper to expand or contract, thereby affecting the overall size of the paper. There is an interaction between the printing temperature, printing speed, and paper humidity. For example, a higher printing temperature and humidity combination may cause the paper to expand rapidly, while a higher printing speed may cause the insufficiently dried ink to cause the paper to expand further. Therefore, when considering paper deformation, not only the offset of the pressure-sensitive point, that is, the influence of printing pressure, is considered, but also the influence of printing temperature, printing speed and paper humidity on paper deformation is comprehensively considered, thereby improving the prediction accuracy.

[0066] Furthermore, after the first side printing is completed, the new position coordinates of each pressure sensitive point are remeasured. The second coordinates (x ′ ,y ′ ,z ′ ), so for each point, the difference between the first coordinate and the second coordinate is calculated to determine the offset, and the offset vector is expressed as Δr = (x ′ -x,y ′ -y,z ′ -z), after obtaining the vector, the offset value can be further calculated.

[0067] S30, predicting the deformation degree of the paper according to the offset of the pressure sensitive point, the first printing parameter and a preset prediction model, and determining whether the deformation degree of the paper is less than a preset threshold.

[0068] In one embodiment, predicting the deformation degree of the paper according to the offset of the pressure sensitive point, the first printing parameter and a preset prediction model includes:

[0069] Building a predictive model:

[0070]

[0071] In the formula, ΔL represents the deformation degree of the paper, e represents the natural constant, D represents the offset of the pressure sensitive point, H, T, and V represent the paper humidity, printing temperature, and printing speed respectively; α, β, are the unknown coefficients to be fitted respectively;

[0072] Build a linear regression model:

[0073]

[0074] In the formula, i represents the i-th group of data, and a total of n groups of data are obtained;

[0075] Use the least squares method to find α, β, Perform linear fitting and solve the solved α, β, Substitute into the prediction model to generate the target prediction model;

[0076] The offset of the pressure sensitive point and the first printing parameter are input into the target prediction model to predict the deformation degree of the paper.

[0077] Specifically, in this embodiment, it is assumed that the model coefficients α, β, They are 0.01, -0.05, 0.1, and 0.02 respectively. Substituting these coefficients back into ΔL, we get:

[0078] ΔL=0.01e-H -0.05e -T +0.1V 2 +0.02D

[0079] Assuming that by collecting printing parameters and calculating the offset of the pressure sensitive point, the paper humidity is 50% RH, the printing temperature is 25°C, the printing speed is 0.5m / s, and the coordinate offset D of the pressure sensitive point is 1mm, substituting into the above formula, it can be calculated that the degree of paper deformation is about -0.68mm, and a negative value indicates shrinkage. In this way, the degree of deformation of the paper after the first side is printed can be accurately predicted.

[0080] S40: When it is determined that the deformation degree of the paper is less than a preset threshold, the printing quality of the first side is evaluated.

[0081] After the deformation degree of the paper is obtained, it is compared with a preset threshold value, so as to first evaluate the influence of the deformation degree on whether to continue printing on the second side. If the deformation degree is less than the preset threshold value, it is considered that the deformation degree is within an ideal range. At this time, it is further considered whether the printing quality is qualified. If it is, the second side can be printed. If not, then continuing to print will result in waste of the second side printing process.

[0082] In one embodiment, the printing quality may be caused by defects on the paper surface itself, which may be caused by uneven ink output during printing (too much, too little, uneven distribution). In order to accurately evaluate the printing quality of the first side, visual inspection can be used in time to collect images of the first side after printing, and train a machine learning model to identify common defect types, such as spots, stripes, missing prints or reprints, etc. The machine learning model includes but is not limited to convolutional neural networks, support vector machines, random forest models, etc. As for the problem of ink output, the reflectivity of the ink can be measured by a spectral reflectometer to evaluate the ink coverage and whether the ink coverage is uniform. Finally, visual inspection can also be used for printing clarity, and a resolution test chart can be used to evaluate the printing clarity. Finally, these results are combined to obtain the printing quality of the first side.

[0083] S50: If the printing quality of the first side meets the preset conditions, the first printing parameters are modified according to the deformation degree of the paper to obtain second printing parameters, and the second printing parameters are used to perform ink printing on the second side of the printing paper.

[0084] When the printing quality of the first side is obtained, if the preset conditions are met, it proves that the current printing paper is qualified for printing on the second side, and the second side can be printed at this time. However, due to the deformation of the paper, if the second side is directly printed according to the previous printing parameters and template, the first side and the second side may not be aligned, thereby affecting the overall printing quality. Therefore, in this embodiment, the first printing parameters are corrected according to the deformation degree of the paper to obtain the second printing parameters, and then the second printing parameters are used to perform ink printing on the second side of the printing paper.

[0085] In one embodiment, the first printing parameter is modified according to the deformation degree of the paper to obtain the second printing parameter, as follows:

[0086] 1) Analyze the main reasons for paper deformation, including ink volume, printing pressure, paper material and humidity, printing speed, printing temperature, etc., to determine which factors cause paper deformation.

[0087] 2) According to the deformation degree of the paper, calculate the compensation factor for each influencing factor. The compensation factor can be a value based on experimental data or empirical formula. For example:

[0088] If the paper deformation is caused by temperature, the printing temperature can be adjusted appropriately to reduce the deformation. For example, if the temperature is too high and the paper expands, the printing temperature can be appropriately lowered; conversely, if the temperature is too low and the paper shrinks, the printing temperature can be appropriately increased.

[0089] Printing speed also affects paper deformation. If the speed is too fast, the ink may not have enough time to dry, causing paper deformation. Therefore, the printing speed can be appropriately reduced to give the ink more drying time to reduce deformation.

[0090] If the humidity of the paper is too high, you can reduce the humidity of the paper by preheating or drying it to reduce deformation.

[0091] If the printing pressure is too high, the deformation can be reduced by reducing the printing pressure appropriately.

[0092] Preferably, when determining a specific correction value, a parameter correction model can be trained. For example, when it is determined that the printing speed causes the paper to deform too much, the paper speed and deformation amount can be used as a training set to train a neural network model. When the paper speed needs to be corrected, only the expected deformation amount needs to be input to quickly obtain the size of the paper speed. Similarly, the same method can be used for other printing parameters to accurately obtain the size of the correction value, which will not be repeated here.

[0093] Therefore, by analyzing the main factors of deformation according to the degree of paper deformation, each parameter in the first printing parameter is corrected, thereby reducing the impact of the deformation after printing on the first side on the printing of the second side, thereby improving the overall printing quality.

[0094] The above embodiment takes into account the case where the deformation degree of the paper is less than the preset threshold. In other cases, when the deformation degree of the paper is greater than or equal to the preset threshold, the second side should generally not be printed, otherwise it will seriously affect the final printing and display effects, thereby causing the printing work of the second side to be wasted, that is, causing a waste of manpower, material and processing resources.

[0095] See also Figure 2 In some embodiments, the method further comprises:

[0096] S60: When it is determined that the deformation degree of the paper is greater than or equal to the preset threshold, the current printing paper is discarded, the first printing parameter is corrected according to the deformation degree of the paper to obtain a third printing parameter, and the third printing parameter is used to perform ink printing on the next printing paper.

[0097] It is understandable that if the deformation degree of the paper is greater than or equal to the preset threshold, the current printing paper should be discarded to avoid using the paper for the second printing. And the paper should be marked as unqualified and recycled or discarded.

[0098] In the previous step S50, the second side is printed on the basis of the completion of the printing of the first side. However, in this embodiment, the deformation degree of this time is taken into consideration, and the first side of the next sheet of paper is to be printed, so the process of adjusting the printing parameters of the two is different. When adjusting the parameters of the next printing as a whole, the specific values ​​of the printing temperature, printing speed and paper humidity that need to be adjusted can be calculated according to the degree of deformation. Then, the third printing parameter is obtained by correcting the first parameter, and the first side of the next sheet of paper is printed using the third printing parameter. Usually, the degree of deformation can be evaluated again after printing is completed to determine whether the parameter adjustment is appropriate, so as to realize the self-learning and iterative optimization process of the printing parameters.

[0099] Therefore, in this embodiment, if the deformation degree is not up to standard, the second side will not be printed, thus avoiding resource waste and ineffective printing operations. As for the initial printing parameters of the next printing, the deformation problem when printing the next sheet of paper can be improved through parameter correction and optimization. The printing deformation problem can be optimized through iterative optimization, thereby improving the overall printing quality.

[0100] It is understandable that in the aforementioned embodiments, for the case where the printing quality meets the preset conditions, parameter correction is considered to improve the quality of the second side printing, thereby ensuring the overall effect of double-sided printing. In some embodiments, if the printing quality does not meet the preset conditions, in addition to eliminating the current printing paper and not printing the second side, the cause of the quality problem should be specifically analyzed, so as to adjust the printing strategy in a targeted manner to improve the energy efficiency of the printing operation.

[0101] Continue to see Figure 2 In some embodiments, the method further comprises:

[0102] S70, if the printing quality of the first side does not meet the preset conditions, discard the current printing paper and determine the corresponding defect type;

[0103] S701, when the defect type is a paper surface defect, use the third printing parameter to perform ink printing on the next printing paper;

[0104] S702: When the defect type is an ink quantity defect, adjust the ink supply quantity, compensate the third printing parameter, and perform ink printing on the next printing paper according to the compensated third printing parameter.

[0105] For defect types, paper surface defects can be identified by visual inspection, while ink volume defects can be identified by measuring the reflectivity of the ink using a spectral reflectometer to evaluate the ink coverage, and the details can be referred to the above embodiment. For these two different defects, if it is a paper surface defect, it means that the printing quality is unqualified due to the problem of the paper itself, and it has nothing to do with the printing parameters themselves. At this time, there is no need to adjust the parameters, and only the third printing parameters need to be used to print the ink on the next printing paper.

[0106] For ink quantity defects, such as too much or too little ink supply, the ink supply should be adjusted, and when compensating the third printing parameter, the compensation factor should be calculated according to the degree of ink quantity defects, so as to compensate for the printing speed, printing temperature and paper humidity on the basis of the third printing parameter, and then the next printing paper is printed with ink according to the compensated third printing parameter, and the printing result can also be tested to ensure that the alignment accuracy and printing quality meet the requirements. If the test result is not ideal, the parameter compensation step is repeated until a satisfactory printing effect is obtained, and the final compensation factor is obtained to obtain the final compensated third printing parameter. For example, the compensation measures can be: reducing the ink supply by 10%, reducing the printing speed by 10%, reducing the printing temperature by 3°C, using a preheater to increase the paper preheating temperature by 10°C, etc.

[0107] Therefore, this embodiment adopts different parameter adjustment measures for different defect types, and can provide reasonable solutions to different quality problems in a targeted manner, thereby improving the printing effect of the first side of the next sheet of paper, and optimizing the adjustment parameters through iterative learning, thereby ultimately improving the printing quality.

[0108] In summary, the method provided in this embodiment can at least achieve the following beneficial effects:

[0109] 1) The present invention can accurately predict the deformation degree of paper by using a preset prediction model by accurately measuring the offset of the pressure sensitive point before and after printing, combining parameters such as printing speed, temperature and paper humidity, thereby improving the accuracy of the prediction.

[0110] 2) After the deformation degree of the paper is obtained, it is determined whether the deformation degree of the paper is less than the preset threshold. If so, the printing quality is further considered, and the printing strategy is further considered based on the printing quality. If not, the current printing paper is discarded, and the first printing parameter is corrected according to the deformation degree of the paper to obtain the third printing parameter, and the third printing parameter is used to perform ink printing on the next printing paper. Since the quality assessment is carried out in time after the first side is printed, it is possible to accurately control whether the second side needs to be printed. Compared with the overall quality assessment after printing, it can avoid the problem of unqualified quality of one side affecting the second side and causing waste of resources, which can greatly improve resource utilization and reduce rework costs.

[0111] 3) When the deformation degree of the paper is less than the preset threshold and the printing quality of the first side is evaluated, if the printing quality of the first side meets the preset conditions, the first printing parameter is corrected according to the deformation degree of the paper to obtain the second printing parameter, and the second printing parameter is used to print ink on the second side of the printing paper; if the printing quality of the first side does not meet the preset conditions, the current printing paper is discarded and the corresponding defect type is determined; when the defect type is a paper surface defect, the third printing parameter is used to print ink on the next printing paper; when the defect type is an ink quantity defect, the ink supply is adjusted, the third printing parameter is compensated, and the next printing paper is printed with ink according to the compensated third printing parameter. Therefore, the present invention considers using different parameter adjustment measures for different defects, and can provide reasonable solutions to different quality problems in a targeted manner, and ultimately greatly improve the quality of printed products.

[0112] See also Figure 3 In one embodiment, the present invention further provides an intelligent control system for a printing process of an inkjet printer, the system comprising:

[0113] The sensitive point marking unit 100 is used to obtain the printing paper to be printed on both sides, mark a number of pressure sensitive points on the first side of the printing paper, and obtain the first coordinates of the pressure sensitive points;

[0114] The offset calculation unit 200 is used to perform ink printing on the first side of the printing paper and collect first printing parameters, obtain the second coordinates of the pressure sensitive point after printing, and calculate the offset of the pressure sensitive point according to the first coordinates and the second coordinates; wherein the first printing parameters include the printing temperature, printing speed and paper humidity of the ink printer;

[0115] The deformation degree prediction unit 300 is used to predict the deformation degree of the paper according to the offset of the pressure sensitive point, the first printing parameter and the preset prediction model, and determine whether the deformation degree of the paper is less than a preset threshold;

[0116] The printing quality evaluation unit 400 is used to evaluate the printing quality of the first side when it is determined that the deformation degree of the paper is less than a preset threshold value;

[0117] The first correction unit 500 is used to correct the first printing parameter to obtain the second printing parameter according to the deformation degree of the paper if the printing quality of the first side meets the preset condition, and use the second printing parameter to perform ink printing on the second side of the printing paper.

[0118] See also Figure 4 In some embodiments, the system further comprises:

[0119] The second correction unit 600 is used to eliminate the current printing paper when it is determined that the deformation degree of the paper is greater than or equal to a preset threshold, correct the first printing parameter according to the deformation degree of the paper to obtain a third printing parameter, and use the third printing parameter to perform ink printing on the next printing paper.

[0120] See also Figure 4 In some embodiments, the system further comprises a parameter compensation unit 700, configured to:

[0121] If the printing quality of the first side does not meet the preset conditions, the current printing paper is discarded and the corresponding defect type is determined;

[0122] When the defect type is a paper surface defect, the third printing parameter is used to perform ink printing on the next printing paper;

[0123] When the defect type is an ink quantity defect, the ink supply quantity is adjusted, the third printing parameter is compensated, and ink printing is performed on the next printing paper according to the compensated third printing parameter.

[0124] It can be understood that the functions or modules included in the system provided in this embodiment can be used to execute the method described in the above method embodiment. Its specific implementation can refer to the description of the above method embodiment. For the sake of brevity, it will not be repeated here.

[0125] The present invention also provides an electronic device, including a processor and a memory, wherein the memory is used to store computer program code, and the computer program code includes computer instructions. When the processor executes the computer instructions, the electronic device executes a method as described in any possible implementation manner.

[0126] The present invention also provides a computer-readable storage medium, in which a computer program is stored. The computer program includes program instructions. When the program instructions are executed by a processor of an electronic device, the processor executes a method as described in any possible implementation manner.

[0127] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0128] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. Those skilled in the art can also clearly understand that the descriptions of the various embodiments of the present invention have different focuses. For the convenience and brevity of description, the same or similar parts may not be repeated in different embodiments. Therefore, for parts not described or not described in detail in a certain embodiment, refer to the records of other embodiments.

Claims

1. An intelligent control method for the printing process of an ink printing press, characterized in that: The method comprises: Obtain printing paper to be printed on both sides, mark a number of pressure-sensitive points on the first side of the printing paper, and obtain first coordinates of the pressure-sensitive points; Perform ink printing on the first side of the printing paper and collect first printing parameters, obtain second coordinates of the pressure sensitive point after printing, and calculate the offset of the pressure sensitive point according to the first coordinates and the second coordinates; wherein the first printing parameters include the printing temperature, printing speed and paper humidity of the ink printer; Predicting the deformation degree of the paper according to the offset of the pressure sensitive point, the first printing parameter and the preset prediction model, and judging whether the deformation degree of the paper is less than a preset threshold; When it is determined that the deformation degree of the paper is less than a preset threshold, evaluating the printing quality of the first side; If the printing quality of the first side meets the preset conditions, the first printing parameters are corrected according to the deformation degree of the paper to obtain second printing parameters, and the second printing parameters are used to perform ink printing on the second side of the printing paper; If the printing quality of the first side does not meet the preset conditions, the current printing paper is discarded and the corresponding defect type is determined; When the defect type is a paper surface defect, the third printing parameter is used to perform ink printing on the next printing paper; When the defect type is an ink quantity defect, the ink supply quantity is adjusted, the third printing parameter is compensated, and ink printing is performed on the next printing paper according to the compensated third printing parameter.

2. The intelligent control method for the printing process of an ink printing press according to claim 1, characterized in that: The method further comprises: When it is determined that the deformation degree of the paper is greater than or equal to the preset threshold, the current printing paper is discarded, the first printing parameter is corrected according to the deformation degree of the paper to obtain the third printing parameter, and the third printing parameter is used to perform ink printing on the next printing paper.

3. An intelligent control system for the printing process of an ink printing press, characterized in that: The system comprises: A sensitive point marking unit is used to obtain the printing paper to be printed on both sides, mark a number of pressure sensitive points on the first side of the printing paper, and obtain the first coordinates of the pressure sensitive points; an offset calculation unit, used to perform ink printing on the first side of the printing paper and collect first printing parameters, obtain second coordinates of the pressure sensitive point after printing, and calculate the offset of the pressure sensitive point according to the first coordinates and the second coordinates; wherein the first printing parameters include the printing temperature, printing speed and paper humidity of the ink printer; A deformation degree prediction unit, used to predict the deformation degree of the paper according to the offset of the pressure sensitive point, the first printing parameter and a preset prediction model, and to determine whether the deformation degree of the paper is less than a preset threshold; A printing quality evaluation unit, configured to evaluate the printing quality of the first side when it is determined that the deformation degree of the paper is less than a preset threshold; A first correction unit is used to correct the first printing parameter to obtain a second printing parameter according to the deformation degree of the paper if the printing quality of the first side meets the preset condition, and use the second printing parameter to perform ink printing on the second side of the printing paper; Parameter compensation unit for: If the printing quality of the first side does not meet the preset conditions, the current printing paper is discarded and the corresponding defect type is determined; When the defect type is a paper surface defect, the third printing parameter is used to perform ink printing on the next printing paper; When the defect type is an ink quantity defect, the ink supply quantity is adjusted, the third printing parameter is compensated, and ink printing is performed on the next printing paper according to the compensated third printing parameter.

4. The intelligent control system for the printing process of an ink printing press according to claim 3, characterized in that: The system further comprises: The second correction unit is used to eliminate the current printing paper when it is determined that the deformation degree of the paper is greater than or equal to a preset threshold, correct the first printing parameter according to the deformation degree of the paper to obtain a third printing parameter, and use the third printing parameter to perform ink printing on the next printing paper.

5. An electronic device, characterized in that: include: A processor and a memory, wherein the memory is used to store computer program code, wherein the computer program code includes computer instructions. When the processor executes the computer instructions, the electronic device executes the intelligent control method for the printing process of an inkjet printer as described in any one of claims 1 to 2.

6. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, which includes program instructions. When the program instructions are executed by a processor of an electronic device, the processor executes the intelligent control method for the printing process of an inkjet printer as described in any one of claims 1 to 2.

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